- Construct quadrilaterals and explore the properties of the parallelogram, rectangle, rhombus or square.- Draw a triangle and its circumscribing circle, then drag one of its corners slowly to cross the opposite side. Visually observe why a straight line is an "infinite circle". Get junior high school kids motivated with the idea of "crosscap" in projective geometry and topology.- Learn about the symmetry you can find in car logos.- Understand why the measures of the interior angles of a triangle always add up to 180 degrees.- Visualize the properties of the rectangle, isosceles or equilateral triangles.- Understand how a Newtonian telescope works and play with its model.- Play with the Trammel of Archimedes to draw ellipse.- Draw an ellipse, then drag one of its focii, and watch how it gradually becomes a hyperbola.- Move the focus of a lens in a Dr. Geo sketch, and learn how a real inverted image morphs into a virtual upright image. Use the macro function to stack two lens and create your microscope in Dr. Geo.- Discover how Eratosthenes calculated the circumference of the Earth.

Plus many more to explore or to create yourself.

All in all Dr. Geo is an interactive geometry application. It allows one tocreate a geometric model you can manipulate according to itsconstraints. It is usable at home or at school, in primary orsecondary education level. With the free Desktop version, you can alsoconstruct very elaborated sketches to share with your friends,students or kids on tablet.

- Construct quadrilaterals and explore the properties of the parallelogram, rectangle, rhombus or square.- Draw a triangle and its circumscribing circle, then drag one of its corners slowly to cross the opposite side. Visually observe why a straight line is an "infinite circle". Get junior high school kids motivated with the idea of "crosscap" in projective geometry and topology.- Learn about the symmetry you can find in car logos.- Understand why the measures of the interior angles of a triangle always add up to 180 degrees.- Visualize the properties of the rectangle, isosceles or equilateral triangles.- Understand how a Newtonian telescope works and play with its model.- Play with the Trammel of Archimedes to draw ellipse.- Draw an ellipse, then drag one of its focii, and watch how it gradually becomes a hyperbola.- Move the focus of a lens in a Dr. Geo sketch, and learn how a real inverted image morphs into a virtual upright image. Use the macro function to stack two lens and create your microscope in Dr. Geo.- Discover how Eratosthenes calculated the circumference of the Earth.

Plus many more to explore or to create yourself.

All in all Dr. Geo is an interactive geometry application. It allows one tocreate a geometric model you can manipulate according to itsconstraints. It is usable at home or at school, in primary orsecondary education level. With the free Desktop version, you can alsoconstruct very elaborated sketches to share with your friends,students or kids on tablet.